Malicious PDF — malware analysis report

Static analysis result for SHA-256 a07befcd6456e29b…

MALICIOUS

PDF

75.9 KB Created: 2021-05-08 23:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 47cd4debb291d41c1561f78ad557cc06 SHA-1: 548401111f6a01c9a2eb0d7fbea574ba3d263793 SHA-256: a07befcd6456e29bd4932a2f786fe561979db10e6702bf404884e2711690908e
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to S3 buckets and other domains, indicative of a link farm or a mechanism for distributing further malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://bologen.ru/strik?utm_term=possessive+pronouns+exercises+5th+grade PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374984/normal_5fdbaf9fc078c.pdfIn PDF document text
    • https://dapalirodo.weebly.com/uploads/1/3/1/4/131483520/4370993.pdfIn PDF document text
    • http://tujijamutibe.sportsontheweb.net/cardinal_and_ordinal_utility_analysis.pdfIn PDF document text
    • http://vojemodipu.sportsontheweb.net/the_anarchist_s_design_book_download.pdfIn PDF document text
    • http://lopitimew.mygamesonline.org/sbi_green_card_application_form_download.pdfIn PDF document text
    • https://mifanupomiseri.weebly.com/uploads/1/3/2/6/132681757/0a0adf5b14e9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393772/normal_5fe3d82fb406b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/kelukakeb/66634614222.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/diccionario_de_filosofia_jose_ferrater_mora_tomo_2.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/56182568901.pdfIn PDF document text
    • https://s3.amazonaws.com/jajuzasalikirut/photosynthesis_worksheet_high_school.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/zuviwudosaponejabogubefi.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/natekaji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa69cc0b-a74f-42cd-a7c3-f439137f8bd7/web_services_penetration_testing_tools.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2e2eff9-9aa5-4cc0-bdcb-914bef132beb/starfinder_flip_mat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63a2a283-236a-4cac-888a-7f97d454920f/78950617989.pdfIn PDF document text
    • https://s3.amazonaws.com/jepavilutabilel/bharatanatyam_dance_information_in_kannada_language.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cb22adb-b609-45cc-b68f-81367df20d0e/bukujikefobutiwewuwabo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e688d1d-cc79-46fa-9a4c-fc491fcfedac/how_to_calculate_velocity_calculus.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE6 5440 bytes
SHA-256: 67bb1124a5638525feb90b0605ec4a14f462130c213e26a4a583993cfe98bc78
font_01_sfnt_off0000ed66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED66 11504 bytes
SHA-256: 38c6d15291332355913e78edea13a1aa518c205f4be61e4c622901f73c8e7f6f
font_02_sfnt_off00011403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11403 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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